Why fibre connectivity must be a front-end consideration in data centre site selection

For all the attention given to power, land and planning in data centre development, fibre connectivity is often treated as something to be resolved later. That's a mistake because to ignore challenges delivering data centre fibre can seriously impact delivery timelines.

In practice, connectivity should be considered at the beginning of the site selection process, not once a preferred location has been identified. Power availability undoubtedly will dominate the conversation, and land will shape what is physically possible, but fibre availability and quantity will determine whether a site launches on time with the correct resilience and whether the development has the optimum commercially viability once operations begin. 

This matters because connectivity is not only a technical utility but a strategic requirement. A site may appear attractive on paper, but if multiple diverse fibre routes are constrained, if wayleaves are likely to prove difficult or if the surrounding network environment cannot support the capacity and resilience operators require, those issues can quickly become programme risks. By the time they are discovered, it may be too late to deliver the overall project on time.

That is especially important where delay has a very real cost. Research and consulting firm STL Partners said in March 2025 that delays to a typical 60 MW data centre project can cost as much as $14.2 million (£11.2m) every month. Even if the exact figure varies by project, the underlying point is clear: anything that creates avoidable delay during delivery deserves scrutiny during site selection and the earlier it is visible the more time there is to mitigate it.

There is also a wider planning context that developers cannot afford to ignore. Our own UK Local Government Connectivity Survey 2026 found that councils are asking for earlier engagement from operators, clearer national coordination and better information to help them manage rollout and resilience challenges. The same survey found that data centre development remains a relatively low priority for most councils, even after the sector's designation as Critical National Infrastructure. More than a third of authorities said they are actively trying to attract data centre investment and a further quarter are working directly with developers, yet only 15% reported carrying out formal economic appraisals on the benefits of data centre siting.

That combination should give the sector pause. On the one hand, there is genuine interest in attracting investment. On the other, data centres are not automatically understood, prioritised or assessed in a consistent way at local level. In that environment, developers cannot assume that a strong power story will carry an application or smooth delivery. Connectivity, resilience and local infrastructure readiness are all part of the picture.

That is one reason fibre should be treated as a front-end issue. Early connectivity diligence helps answer questions that become far more difficult later like, How close is the site to suitable fibre infrastructure?'; 'Is there multiple realistic route diversity?; What are the likely delivery times for connections?; Are there known civil engineering constraints?; Could access, wayleave or third-party land issues delay deployment?; Does the surrounding network support the resilience profile required by customers and operators?

These are all key parts of determining whether a site is genuinely ready for development in the timescale desired.

Early assessment also improves conversations with planners, local authorities and infrastructure partners. If a developer can show that connectivity has already been examined seriously alongside power, transport and environmental considerations, the project is in a much stronger position. It signals that digital infrastructure has been thought about in the round rather than assumed.

There is a broader lesson here as the market continues to grow. The most successful data centre developments are unlikely to be the ones that identify power and hope the rest falls into place. They will be the ones that recognise infrastructure readiness as a package, with fibre connectivity sitting towards the front of consideration.

In other words, the question is not whether connectivity matters. It is whether developers are looking at it early enough in their thinking. If connectivity is not considered in the initial investment decision, timescales can be impacted and the site may not succeed at all.